Lamp



FIG. 1 is a perspective view of a lamp embodying the design of the present invention.

FIG. 2 is a front side elevational view of the lamp illustrated in FIG. 1, with the left side elevational view, the right side elevational view and the back side elevational view being identical thereto.

FIG. 3 is a top view of the lamp of FIG. 1; and,

FIG. 4 is a bottom view of the lamp of FIG. 1.

The lamp shade shown in broken lines does not form a part of the claimed design. 

The ornamental design for a lamp, substantially as shown and described. 